I have picked out a couple smaller plot sights that I want to get ready for a fall planting. However they are in spots where you could never reach them with any type of serious tillage equipment. Instead I'm just going to spray it a couple times with round up to kill the weeds, clear off the dead stuff and then broadcast the seeds. my question is how heavy am i supposed to apply the round up? is there a general rule of thumb that says to apply x number of gallons/acre?